package com.scx.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.scx.constant.MessageConstant;
import com.scx.dto.UserLoginDTO;
import com.scx.entity.User;
import com.scx.exception.LoginFailedException;
import com.scx.mapper.UserMapper;
import com.scx.properties.WeChatProperties;
import com.scx.service.UserService;
import com.scx.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper,User> implements UserService {
    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;

    /**
     * 调用微信接口服务，获取微信用户的openid
     * @param code
     */
    private String getOpenid(String code){
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(json);
        return jsonObject.getString("openid");
    }

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());

        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(User::getOpenid,openid);
        User user = userMapper.selectOne(queryWrapper);

        //如果是新用户,自动完成注册
        if(user==null){
            user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);
        }

        return user;
    }
}
